@WhimsiCat
I guess I'm not really sure about the connection. One Punch Man uses a dry, dark humor, and rather than being grounded, it portrays over the top absurdity with disinterest. (For a general take on immortality blues, I recommend
The Last Unicorn, by Peter S. Beagle, for its ability to make the emotional toll feel real; and
Accelerando, by Charles Stross, for taking the idea and expanding it to a societal scale.)
@Pyoro @Purplelibraryguy
I wouldn't be surprised to find out later that she actually wanted to become a vampire, and the justification she gave was false. Since her dream was to run with Yuu, the only way she could accomplish that would be if she had super strength too.